Qt for Python (PySide/Shiboken)

I'm trying call it's object via promoted widget using QtDesigner then will be used inside the main window # -*- coding: utf-8 -*- ################################################################################ ## Form generated from reading UI file 'interface.ui' ## ## Created by: Qt User Interface Compiler version 5.15.2 ## ## WARNING! All changes made in this file will be lost when recompiling UI file! ################################################################################ from PySide2.QtCore import * from PySide2.QtGui import * from PySide2.QtWidgets import * from nodz_main import Nodz class Ui_MainWindow(object): def setupUi(self, MainWindow): if not MainWindow.objectName(): MainWindow.setObjectName(u"MainWindow") MainWindow.resize(997, 600) self.centralwidget = QWidget(MainWindow) self.centralwidget.setObjectName(u"centralwidget") self.treeView = QTreeView(self.centralwidget) self.treeView.setObjectName(u"treeView") self.treeView.setGeometry(QRect(0, 10, 256, 561)) self.graphicsView = Nodz(self.centralwidget) self.graphicsView.setObjectName(u"graphicsView") self.graphicsView.setGeometry(QRect(260, 10, 691, 581)) MainWindow.setCentralWidget(self.centralwidget) self.menubar = QMenuBar(MainWindow) self.menubar.setObjectName(u"menubar") self.menubar.setGeometry(QRect(0, 0, 997, 20)) MainWindow.setMenuBar(self.menubar) self.statusbar = QStatusBar(MainWindow) self.statusbar.setObjectName(u"statusbar") MainWindow.setStatusBar(self.statusbar) self.retranslateUi(MainWindow) QMetaObject.connectSlotsByName(MainWindow) # setupUi def retranslateUi(self, MainWindow): MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"MainWindow", None)) # retranslateUi